Sacroiliac joint disorder is often manifested as bending limitation pain, lumbar pain, etc., which may be caused by some physiological reasons, such as sedentary, standing for a long time, etc., as well as some disease reasons, such as lumbar muscle strain, lumbar intervertebral disc herniation. 1. Physiological reasons: such as sedentary, standing for a long time to maintain a position may lead to the muscles around the joints, ligament laxity, at this time, if the sudden bending such as picking up things, carrying heavy objects, resulting in joint instability, may appear sacroiliac joint disorders. 2. Lumbar muscle strain: Excessive lumbar exercise overloads the lumbar muscles, resulting in muscle injuries and ligament strains, etc. When the sacroiliac joints are active, the surrounding muscles and ligaments are not strong enough to support and cooperate with the joints, so that the sacrum cannot be stabilized in the pelvis, leading to disorders of the sacroiliac joints and pain. 3. Lumbar intervertebral disc herniation: lumbar intervertebral disc degeneration, loss of elasticity of the nucleus pulposus, fibrous ring rupture, intervertebral joints of the amplitude of the micromovement of the spinal column, spinal mechanics distribution changes, the sacroiliac joints are subjected to abnormal mechanical stimulation in the body when a large number of activities, and the sacroiliac joints are prone to sacroiliac joint disorders in a long period of time. In addition to the above reasons, rheumatoid arthritis, ankylosing spondylitis and other diseases may also appear sacroiliac joint disorder symptoms. If the symptoms of sacroiliac joint disorder appear, after eliminating the physiological causes, you should go to the hospital for appropriate treatment.